修复无法识别部分旧版本 Forge 模组的问题 (#4658)

HMCLCore/src/main/java/org/jackhuang/hmcl/mod/modinfo/ForgeOldModMetadata.java

@@ -19,6 +19,8 @@ package org.jackhuang.hmcl.mod.modinfo;
 
 import com.google.gson.JsonParseException;
 import com.google.gson.annotations.SerializedName;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
 import org.jackhuang.hmcl.mod.LocalModFile;
 import org.jackhuang.hmcl.mod.ModLoaderType;
 import org.jackhuang.hmcl.mod.ModManager;
@@ -125,9 +127,27 @@ public final class ForgeOldModMetadata {
         Path mcmod = fs.getPath("mcmod.info");
         if (Files.notExists(mcmod))
             throw new IOException("File " + modFile + " is not a Forge mod.");
-        List<ForgeOldModMetadata> modList = JsonUtils.fromJsonFile(mcmod, listTypeOf(ForgeOldModMetadata.class));
+
+        List<ForgeOldModMetadata> modList;
+
+        try (var reader = Files.newBufferedReader(mcmod);
+             var jsonReader = new JsonReader(reader)) {
+            JsonToken firstToken = jsonReader.peek();
+
+            if (firstToken == JsonToken.BEGIN_ARRAY)
+                modList = JsonUtils.GSON.fromJson(jsonReader, listTypeOf(ForgeOldModMetadata.class));
+            else if (firstToken == JsonToken.BEGIN_OBJECT) {
+                ForgeOldModMetadataLst list = JsonUtils.GSON.fromJson(jsonReader, ForgeOldModMetadataLst.class);
+                if (list == null)
+                    throw new IOException("Mod " + modFile + " `mcmod.info` is malformed");
+                modList = list.modList();
+            } else {
+                throw new JsonParseException("Unexpected first token: " + firstToken);
+            }
+        }
+
         if (modList == null || modList.isEmpty())
-            throw new IOException("Mod " + modFile + " `mcmod.info` is malformed..");
+            throw new IOException("Mod " + modFile + " `mcmod.info` is malformed");
         ForgeOldModMetadata metadata = modList.get(0);
         String authors = metadata.getAuthor();
         if (StringUtils.isBlank(authors) && metadata.getAuthors().length > 0)

HMCLCore/src/main/java/org/jackhuang/hmcl/mod/modinfo/ForgeOldModMetadataLst.java

@@ -0,0 +1,29 @@
+/*
+ * Hello Minecraft! Launcher
+ * Copyright (C) 2025 huangyuhui <huanghongxun2008@126.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.jackhuang.hmcl.mod.modinfo;
+
+import org.jackhuang.hmcl.util.gson.JsonSerializable;
+
+import java.util.List;
+
+/// @author Glavo
+@JsonSerializable
+public record ForgeOldModMetadataLst(
+        int modListVersion,
+        List<ForgeOldModMetadata> modList) {
+}